codeforce -39E-What Has Dirichlet Got to Do with That?(博弈+dfs)
You all know the Dirichlet principle, the point of which is that if n boxes have no less than n + 1 items, that leads to the existence of a box in which there are at least two items.
Having heard of that principle, but having not mastered the technique of logical thinking, 8 year olds Stas and Masha invented a game. There are a different boxes and b different items, and each turn a player can either add a new box or a new item. The player, after whose turn the number of ways of putting b items into a boxes becomes no less then a certain given number n, loses. All the boxes and items are considered to be different. Boxes may remain empty.
Who loses if both players play optimally and Stas's turn is first?
Input
The only input line has three integers a, b, n (1 ≤ a ≤ 10000, 1 ≤ b ≤ 30, 2 ≤ n ≤ 109) — the initial number of the boxes, the number of the items and the number which constrains the number of ways, respectively. Guaranteed that the initial number of ways is strictly less than n.
Output
Output "Stas" if Masha wins. Output "Masha" if Stas wins. In case of a draw, output "Missing".
Examples
2 2 10
Masha
5 5 16808
Masha
3 1 4
Stas
1 4 10
Missing
Note
In the second example the initial number of ways is equal to 3125.
- If Stas increases the number of boxes, he will lose, as Masha may increase the number of boxes once more during her turn. After that any Stas's move will lead to defeat.
- But if Stas increases the number of items, then any Masha's move will be losing.
题意:(a+x)^(b+y)>n,输出败者
dfs遍历每一种情况,递归到底之后回溯。
#include<bits/stdc++.h>
using namespace std;
#define ll long long
bool kp(ll a,ll b,ll n)
{
ll r=;
while(b)
{
if(b&)r=r*a;
if(r>=n||a>=n)return ;
a=a*a;b=b/;
}
return ;
}
int dfs(ll a,ll b,ll n)//dfs(a,b,n)表示当参数为a,b,n时对于先手的状态。
{
bool k1=kp(a+,b,n),k2=kp(a,b+,n);
if(a==&&!k1)return ;//平局
if(k2&&!dfs(a,b+,n))return ;//把败态转移给对方
if(k1&&!dfs(a+,b,n))return ;//同上
if(k1&&dfs(a+,b,n)==)return ;//无法把败态转移给对方但是可以维持平局
if(k2&&dfs(a,b+,n)==)return ;//同上
return ;//无论怎样操作都把胜态留给对手
}
int main()
{
ll a,b,n;scanf("%lld%lld%lld",&a,&b,&n);
int t=dfs(a,b,n);
if(t==)printf("Masha\n");
else if(t==)printf("Stas\n");
else printf("Missing\n");
return ;
}
codeforce -39E-What Has Dirichlet Got to Do with That?(博弈+dfs)的更多相关文章
- CF 39E What Has Dirichlet Got to Do with That? (博弈)
转载请注明出处,谢谢http://blog.csdn.net/ACM_cxlove?viewmode=contents by---cxlove 题意:给出a ^ b,两个人轮流操作,可以 a ...
- Codeforces 39E What Has Dirichlet Got to Do with That? 游戏+内存搜索
主题链接:点击打开链接 意甲冠军: 特定 a一箱 b球 不变n (球和箱子都不尽相同,样的物品) 设 way = 把b个球放到a个箱子中的方法数, 若way >= n则游戏结束 有2个人玩游戏. ...
- CF 39E. What Has Dirichlet Got to Do with That?(记忆化搜索+博弈论)
传送门 解题思路 首先很好写出一个\(O(ab)\)的记搜,但发现这样无法处理\(a=1\)和\(b=1\)的情况,这两种情况需要特判.首先\(a=1\)的情况,就是如果当前选手让\(a+1\)必胜, ...
- D. New Year Santa Network 解析(思維、DFS、組合、樹狀DP)
Codeforce 500 D. New Year Santa Network 解析(思維.DFS.組合.樹狀DP) 今天我們來看看CF500D 題目連結 題目 給你一棵有邊權的樹,求現在隨機取\(3 ...
- LDA( Latent Dirichlet Allocation)主题模型 学习报告
1 问题描述 LDA由Blei, David M..Ng, Andrew Y..Jordan于2003年提出,是一种主题模型,它可以将文档集中每篇文档的主题以概率分布的形式给出,从而通过分析一 ...
- [综] Latent Dirichlet Allocation(LDA)主题模型算法
多项分布 http://szjc.math168.com/book/ebookdetail.aspx?cateid=1&§ionid=983 二项分布和多项分布 http:// ...
- 沃罗诺伊图(Voronoi Diagram,也称作Dirichlet tessellation,狄利克雷镶嵌)
沃罗诺伊图(Voronoi Diagram,也称作Dirichlet tessellation,狄利克雷镶嵌)是由俄国数学家格奥尔吉·沃罗诺伊建立的空间分割算法.灵感来源于笛卡尔用凸域分割空间的思想. ...
- Codeforce - Street Lamps
Bahosain is walking in a street of N blocks. Each block is either empty or has one lamp. If there is ...
- 关于Beta分布、二项分布与Dirichlet分布、多项分布的关系
在机器学习领域中,概率模型是一个常用的利器.用它来对问题进行建模,有几点好处:1)当给定参数分布的假设空间后,可以通过很严格的数学推导,得到模型的似然分布,这样模型可以有很好的概率解释:2)可以利用现 ...
随机推荐
- Go sqlx库
sqlx is a library which provides a set of extensions on go's standard database/sql library. sqlx sup ...
- 【P1714】切蛋糕(单调队列)
实在不明白难度等级,难不成前缀和是个很变态的东西? 说白了就是单调队列裸题,都没加什么别的东西,就是一个前缀和的计算,然而这个题也不是要用它优化,而是必须这么做啊. #include<iostr ...
- js获取css样式方法
一.CSS样式共有三种:内联样式(行间样式).内部样式.外部样式(链接式和导入式) <div id="a" style="width: 100px;height: ...
- JMeter参数文件的相对路径
很多教程里都说“尽可能将参数文件配置为相对路径,以更好的去适配Slave环境”或者“把XX放到相对路径” 这里相对路径是指的 C:\Program Files (x86)\apache-jmeter- ...
- c++ STL库deque和vector的例子
头文件wuyong.h: #pragma once #include<iostream> #include<vector> #include<deque> #inc ...
- Eclipse下创建简单Servlet
参考文章:一个简单的Servlet程序 http://blog.csdn.net/a153375250/article/details/50916428 Servlet简介 Servlet是什么?简 ...
- java对象流(一)
注意:字节数组流是可以不用关闭的(字符数组流要不要关闭暂时不清楚). 对象流的读数据和写数据方法分别是writeObject(Object o)和readObject(Object o). Objec ...
- hzau 1208 Color Circle(dfs)
1208: Color Circle Time Limit: 1 Sec Memory Limit: 1280 MBSubmit: 289 Solved: 85[Submit][Status][W ...
- Python - 批量改变文件名
import osimport sysimport datetime path = "E:\python_test"datename = '2016-02-11'a = datet ...
- Spring_总结_03_装配Bean(四)_导入与混合配置
一.前言 本文承接上一节:Spring_总结_03_装配Bean(三)之XML配置 在典型的Spring应用中,我们可能会同时使用自动化和显示配置.同时,可能在某些场景下我们需要混合使用JavaCon ...